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Bicycle bottom bracket centre finder/measurer — image 1

Bicycle bottom bracket centre finder/measurer

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Helps get accurate measurement from BB to seat

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Model information

License
Creative Commons — Public Domain

This little widget pops into your crank bolt (assuming it has an 8mm hex) and features a slot on the outside for your tape measure to bite into. It helps you get a highly precise measurement of seat height (in combination with something like one of the 80mm finding tools available).

Print in any material you have, it's not a stressed part.

100% my own design but inspired by something I saw somewhere - apologies if the idea was yours!